"Southwest Airlines 31, a Boeing 737 aircraft, rolled off a taxiway into the grass and got stuck while taxiing to its gate at Nashville International Airport at 5:30 p.m. Central Time. Passengers left the aircraft via stairs and were bussed to the terminal," said FAA spokeswoman Kathleen Bergen.

Five crew members and 133 passengers were on board the plane at the time of the incident, according to Southwest Airlines.

The FAA is investigating.

There did not appear to have been bad weather in Nashville. Skies were clear with a reported temperature of around 55° Fahrenheit on Tuesday evening.